Salt Spring Fire-Rescue was called to the scene of an unknown spill on St. Mary Lake Tuesday afternoon after residents spotted a viscous turquoise liquid rimming the shore near Langs Road.
“I was appalled when I saw it,” said local property owner Jack Giles, adding he’d never seen anything like it during his nine years on the lake.
While the substance certainly looked like it could have been paint or another unknown product with chemical origins, it was quickly determined to be a concentration of blue green algae. North Salt Spring Waterworks District’s environmental manager Meghan McKee arrived on scene not long after Salt Spring firefighter Mitchell Sherrin and confirmed the most likely identification.
“It’s almost certainly algae,” McKee said after scooping up a plastic bottle of forest-green liquid.
“I would stress this is normal for this time of year and it’s just alarming because of its colour,” she added.
McKee explained that cyanobacteria can control their buoyancy to move up and down a water column, and often rise to the lake’s surface at night. Tuesday morning’s brisk winds pushed a concentration of algae into the northern shoreline, which is what made the colour appear so intense.
Neither of NSSWD’s two water intakes are located near that part of the lake, but the district conducts weekly water quality tests and has yet to detect any toxic bacteria this winter. Results from the recent sample probably won’t be available until after Christmas. In the meantime, McKee advised pet owners to keep their animals out of the lake and property owners who draw water directly from the lake to ensure it passes through several filtration cycles.
The Ministry of Environment and the Capital Regional District would be notified, McKee said.
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